The PT438 is a battery management system with PMIC (Power Management IC) manufactured by PUOLOP. It is available in a SOT23-6L RoHS package, meaning that it is lead free compliant. The device is used for advanced charging control in various applications such as mobile phones, tablets, notebook computers and many other consumer products. It supports wide input voltage range from 3.7V to 28V, reversible current protection, multiple brands of Li-ion batteries, auto-step-down of input current based on battery temperature and boasts of high efficiency and fast charging. It also has over-voltage protection, short circuit protection, temperature protection and many other protection features.